



export function observer(element: HTMLDivElement, callback: (target:HTMLDivElement)=>void) {
    if (!element) {
      return false;
    }
    // 开始监听
  }
  
  export function unobserver(
    element: HTMLDivElement | null,
    callback: (target:HTMLDivElement)=>void
  ) {
    if (!element) {
      return false;
    }
  }